I have noticed on a forceful end task (pkill) when starting again it opens crawler stacks with 0 urls.
Also Pi config -XX:+UseParNewGC -XX:ParallelGCThreads=2
Old pc -XX:+UseParNewGC -XX:ParallelGCThreads=8 -d64

Cloned and did a fresh peer after running e4defrag and started to crawl a few sites it was still crawling this morning. 500 ppm was the top crawl speed.
Using -XX:+UseParNewGC -XX:ParallelGCThreads=7 -d64
Why does the fresh install Version show up 1.921/9000?
All the others upgrades where 9388.
Did a heapdump and found the file. http://45.77.100.168/heapdumps.tar.gz [^] 116304045 Bytes
I will try the other peer after upgrade today sometime.
The screen shot is of JVisualM Screenshot from 2017-10-01 09-11-37.png.tar.gz

I enabled the jsresort and it crashed my peer.
I did an emergency restore of /DATA/index/*.* to another newfolder of a yacy server because of disk performance issues in the particular folder I was using.
I tested with dd if=/dev/zero of=/mnt/md0/test bs=512k count=20
and had over 600 MB/s an hot upgrade with yacy stopped I was getting lessthan 1 MB/s transfer.
I modified Grub. EDIT: to solve this, either remove enough RAM, or add “mem=8G” as kernel boot parameter (e.g. in /etc/default/grub on Ubuntu — don’t forget to run update-grub !) https://fhackts.wordpress.com/2014/03/10/very-slow-disk-write-performance-linux/ [^] I have no idea really but there is a hs_err_pid24830.log in the old yacy folder. #ShiftDel